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            <h1 class="post-title">《Dart语言基础之Data》</h1>
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        <date class="post-meta meta-date">
            2021年8月30日
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<p>本文主要介绍</p>
</blockquote>
<pre><code>(DateTime.now().millisecondsSinceEpoch / 1000).toInt();
</code></pre><p>近期在研究 <code>Dart</code> 源码， 把关于 <code>Date</code> 这一块写个文章进行整理分享。</p>
<p>在 <code>Dart</code> 中操作日期通过 <code>DateTime</code> 类来实现。</p>
<p>由于 <code>DateTime</code> 是 <code>Dart</code> 内置的，所以不需要导入。</p>
<h1 id="解析">解析</h1>
<ul>
<li>DateTime</li>
<li>DateTime.parse</li>
<li>DateTime.tryParse</li>
<li>DateTime.utc</li>
</ul>
<p>解析一个日期可以通过 <code>DateTime.parse</code> 静态方法</p>
<p>一个典型的例子：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java">String str <span style="color:#f92672">=</span> <span style="color:#960050;background-color:#1e0010">&#39;</span>2020<span style="color:#f92672">-</span>02<span style="color:#f92672">-</span>20 22<span style="color:#f92672">:</span>48<span style="color:#f92672">:</span>18<span style="color:#960050;background-color:#1e0010">&#39;</span><span style="color:#f92672">;</span>
DateTime date <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">parse</span><span style="color:#f92672">(</span>str<span style="color:#f92672">);</span>

print<span style="color:#f92672">(</span>date<span style="color:#f92672">);</span>  <span style="color:#75715e">// 2020-02-20 22:48:18.000
</span></code></pre></div><p><code>parse</code> 参数接收一个字符串, 能够被解析的有以下格式：</p>
<pre><code>/**
  * &quot;2012-02-27 13:27:00&quot;
  * &quot;2012-02-27 13:27:00.123456789z&quot;
  * &quot;2012-02-27 13:27:00,123456789z&quot;
  * &quot;20120227 13:27:00&quot;
  * &quot;20120227T132700&quot;
  * &quot;20120227&quot;
  * &quot;+20120227&quot;
  * &quot;2012-02-27T14Z&quot;
  * &quot;2012-02-27T14+00:00&quot;
  * &quot;-123450101 00:00:00 Z&quot;
  * &quot;2002-02-27T14:00:00-0500&quot;
  */
</code></pre><p><code>parse</code> 方法还有一个对应的 <code>tryParse</code> 的静态方法, 实际上就是 <code>parse</code> 的语法糖</p>
<pre><code>tryParse` 如果接收的参数无法被解析那么不会抛出异常，而是返回 `null
</code></pre><p><code>tryParse</code> 的内部实现原理：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">try</span> <span style="color:#f92672">{</span>
  <span style="color:#66d9ef">return</span> parse<span style="color:#f92672">(</span>formattedString<span style="color:#f92672">);</span>
<span style="color:#f92672">}</span> on FormatException <span style="color:#f92672">{</span>
  <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">null</span><span style="color:#f92672">;</span>
<span style="color:#f92672">}</span>
</code></pre></div><p>还可以通过 <code>DateTime</code> 实例进行解析, 可以接收8个参数，第一个是年份必填，剩余的是选填，如下：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#75715e">/**
</span><span style="color:#75715e"> *  DateTime(int year,
</span><span style="color:#75715e"> *     [int month = 1,
</span><span style="color:#75715e"> *     int day = 1,
</span><span style="color:#75715e"> *     int hour = 0,
</span><span style="color:#75715e"> *     int minute = 0,
</span><span style="color:#75715e"> *     int second = 0,
</span><span style="color:#75715e"> *     int millisecond = 0,
</span><span style="color:#75715e"> *     int microsecond = 0])
</span><span style="color:#75715e"> */</span>
DateTime date <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">(</span>2020<span style="color:#f92672">);</span>

<span style="color:#75715e">// 2020年2月22日 22小时22分22秒
</span><span style="color:#75715e"></span>DateTime date2 <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">(</span>2020<span style="color:#f92672">,</span> 2<span style="color:#f92672">,</span> 22<span style="color:#f92672">,</span> 22<span style="color:#f92672">,</span> 22<span style="color:#f92672">,</span> 22<span style="color:#f92672">);</span>
</code></pre></div><p>如果想解析成 <code>utc</code> , 可以调用它的静态方法，参数和 <code>DateTime</code> 一致</p>
<pre><code>DateTime date1 = DateTime.utc(2020, 2, 22, 22, 22, 22);
</code></pre><h1 id="取值">取值</h1>
<p>取得当前时间</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java">DateTime n <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">();</span>
print<span style="color:#f92672">(</span>n<span style="color:#f92672">);</span>   <span style="color:#75715e">// 2020-02-20 23:05:04.332418
</span></code></pre></div><p>取得一个以毫秒时间戳</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">int</span> t <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">millisecondsSinceEpoch</span><span style="color:#f92672">;</span>
print<span style="color:#f92672">(</span>t<span style="color:#f92672">);</span>  <span style="color:#75715e">// 1582211214849
</span></code></pre></div><p>取得一个以微秒时间戳</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">int</span> t <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">microsecondsSinceEpoch</span><span style="color:#f92672">;</span>
print<span style="color:#f92672">(</span>t<span style="color:#f92672">);</span>  <span style="color:#75715e">// 1582211566844552
</span></code></pre></div><p>取得当前时区</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java">String timeZone <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">timeZoneName</span><span style="color:#f92672">;</span>
print<span style="color:#f92672">(</span>timeZone<span style="color:#f92672">);</span>
</code></pre></div><p>取得一周的星期几</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">int</span> w <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">weekday</span><span style="color:#f92672">;</span>
print<span style="color:#f92672">(</span>w<span style="color:#f92672">);</span>  <span style="color:#75715e">// 4
</span></code></pre></div><p>取得当前时区的偏移时差 (北京时区是东八区，领先UTC八个小时)</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java">Duration offset <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">timeZoneOffset</span><span style="color:#f92672">;</span>
print<span style="color:#f92672">(</span>offset<span style="color:#f92672">);</span>    <span style="color:#75715e">// 8:00:00.000000
</span></code></pre></div><p>取得当前年份</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">int</span> year <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">year</span><span style="color:#f92672">;</span>
print<span style="color:#f92672">(</span>year<span style="color:#f92672">);</span>      <span style="color:#75715e">// 2020
</span></code></pre></div><p>取得当前月份 (1-12), 这跟JS里有点不同</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">int</span> month <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">month</span><span style="color:#f92672">;</span>
print<span style="color:#f92672">(</span>month<span style="color:#f92672">);</span>      <span style="color:#75715e">// 2
</span></code></pre></div><p>取得当前月份的第几天 (1-31)</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">int</span> day <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">day</span><span style="color:#f92672">;</span>
print<span style="color:#f92672">(</span>day<span style="color:#f92672">);</span>      <span style="color:#75715e">// 21
</span></code></pre></div><p>取得当前小时 (0-23)</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">int</span> hour <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">hour</span><span style="color:#f92672">;</span>
print<span style="color:#f92672">(</span>hour<span style="color:#f92672">);</span>      <span style="color:#75715e">// 8
</span></code></pre></div><p>取得当前分钟 (0-59)</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">int</span> minute <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">minute</span><span style="color:#f92672">;</span>
print<span style="color:#f92672">(</span>minute<span style="color:#f92672">);</span>      <span style="color:#75715e">// 18
</span></code></pre></div><p>取得当前秒 (0-59)</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">int</span> second <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">second</span><span style="color:#f92672">;</span>
print<span style="color:#f92672">(</span>second<span style="color:#f92672">);</span>      <span style="color:#75715e">// 18
</span></code></pre></div><p>取得当前毫秒 (0-999)</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">int</span> millisecond <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">millisecond</span><span style="color:#f92672">;</span>
print<span style="color:#f92672">(</span>millisecond<span style="color:#f92672">);</span>      <span style="color:#75715e">// 249
</span></code></pre></div><p>取得当前微秒 (0-999)</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">int</span> microsecond <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">microsecond</span><span style="color:#f92672">;</span>
print<span style="color:#f92672">(</span>microsecond<span style="color:#f92672">);</span>      <span style="color:#75715e">// 249
</span></code></pre></div><h1 id="显示">显示</h1>
<ul>
<li>toString</li>
<li>toIso8601String</li>
<li>toLocal</li>
<li>toUtc</li>
</ul>
<p><strong><code>toString</code></strong> 要把一个 <code>DateTime</code> 转换成时间可以使用 <code>toString</code> 方法</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java">String str <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">toString</span><span style="color:#f92672">();</span>
print<span style="color:#f92672">(</span>str<span style="color:#f92672">);</span>     <span style="color:#75715e">// 2020-02-22 01:01:01.182096
</span></code></pre></div><p><strong><code>toIso8601String</code></strong> 转换成 [ISO 8601](<a href="https://baike.baidu.com/item/ISO">https://baike.baidu.com/item/ISO</a> 8601)</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java">String str <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">toIso8601String</span><span style="color:#f92672">();</span>
print<span style="color:#f92672">(</span>str<span style="color:#f92672">);</span>   <span style="color:#75715e">// 2020-02-22T22:12:30.159729
</span></code></pre></div><p><strong><code>toLocal</code></strong> 在本地时区返回此DateTime值</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java">DateTime date <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">toLocal</span><span style="color:#f92672">();</span>
print<span style="color:#f92672">(</span>date<span style="color:#f92672">);</span>   <span style="color:#75715e">// 2020-02-22 22:27:57.641258
</span></code></pre></div><p><strong><code>toUtc</code></strong> 在UTC时区中返回此DateTime值</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java">DateTime date <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">.</span><span style="color:#a6e22e">now</span><span style="color:#f92672">().</span><span style="color:#a6e22e">toUtc</span><span style="color:#f92672">();</span>
print<span style="color:#f92672">(</span>date<span style="color:#f92672">);</span>   <span style="color:#75715e">// 2020-02-22 03:27:09.564188Z
</span></code></pre></div><h1 id="操作">操作</h1>
<ul>
<li>add() 通过增加时间来改变原始的 DateTime</li>
<li>subtract() 通过减去时间来改变原始的 DateTime</li>
</ul>
<p><code>add()</code> 参数接收的是 <code>Duration</code> 类型, 下面例子由原来的 <code>0小时</code> 新增了 1小时</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java">Duration oneHours <span style="color:#f92672">=</span> Duration<span style="color:#f92672">(</span>hours<span style="color:#f92672">:</span> 1<span style="color:#f92672">);</span>
String date <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">(</span>2020<span style="color:#f92672">).</span><span style="color:#a6e22e">add</span><span style="color:#f92672">(</span>oneHours<span style="color:#f92672">).</span><span style="color:#a6e22e">toString</span><span style="color:#f92672">();</span>
print<span style="color:#f92672">(</span>date<span style="color:#f92672">);</span>    <span style="color:#75715e">// 2020-01-01 01:00:00.000
</span></code></pre></div><p><code>subtract()</code> 是 <code>add()</code> 反向操作, 用法跟 <code>add</code> 一致，不再阐述。</p>
<h1 id="查询">查询</h1>
<ul>
<li>isBefore</li>
<li>isAfter</li>
<li>isAtSameMomentAs</li>
<li>compareTo</li>
</ul>
<p><strong>isBefore</strong> 检查一个 <code>DateTime</code> 是否在另一个 <code>DateTime</code> 之前</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java">DateTime date1 <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">(</span>2020<span style="color:#f92672">);</span>
DateTime date2 <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">(</span>2019<span style="color:#f92672">);</span>

print<span style="color:#f92672">(</span>date1<span style="color:#f92672">.</span><span style="color:#a6e22e">isBefore</span><span style="color:#f92672">(</span>date2<span style="color:#f92672">));</span>   <span style="color:#75715e">// false
</span></code></pre></div><p><strong>isAfter</strong> 检查一个 <code>DateTime</code> 是否在另一个 <code>DateTime</code> 之后</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java">DateTime date1 <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">(</span>2020<span style="color:#f92672">);</span>
DateTime date2 <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">(</span>2019<span style="color:#f92672">);</span>

print<span style="color:#f92672">(</span>date1<span style="color:#f92672">.</span><span style="color:#a6e22e">isAfter</span><span style="color:#f92672">(</span>date2<span style="color:#f92672">));</span>   <span style="color:#75715e">// true
</span></code></pre></div><p><strong>isAtSameMomentAs</strong> 如果此事件与other同时发生，则返回true.</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java">DateTime date1 <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">(</span>2020<span style="color:#f92672">);</span>
DateTime date2 <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">(</span>2019<span style="color:#f92672">);</span>

print<span style="color:#f92672">(</span>date1<span style="color:#f92672">.</span><span style="color:#a6e22e">isAtSameMomentAs</span><span style="color:#f92672">(</span>date2<span style="color:#f92672">));</span>   <span style="color:#75715e">// false
</span></code></pre></div><p><strong>compareTo</strong> 判断2个 <code>DateTime</code> 是否相等，如果相等则返回 <code>0</code> 否则 <code>-1</code></p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java">DateTime date1 <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">(</span>2020<span style="color:#f92672">);</span>
DateTime date2 <span style="color:#f92672">=</span> DateTime<span style="color:#f92672">(</span>2020<span style="color:#f92672">);</span>

print<span style="color:#f92672">(</span>date1<span style="color:#f92672">.</span><span style="color:#a6e22e">compareTo</span><span style="color:#f92672">(</span>date2<span style="color:#f92672">));</span>   <span style="color:#75715e">// 0
</span></code></pre></div>
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            <a target="_blank" href="http://yuedu.baidu.com/ebook/14a722970740be1e640e9a3e" title="Android Gradle权威指南">Android Gradle权威指南</a>
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